The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A full bridge modular multilevel converter (FBMMC) can work in buck and boost modes. It is thus suitable for grid-connected applications in which the dc link voltage varies over a wide range. In this work the emphasis is set on the steady-state analysis of the grid-connected FBMMC under different levels of the dc link voltage. Two control strategies for the dc capacitor voltage are considered and...
This paper presents a single-stage isolated softswitching tri-port converter for integrating a renewable resource like solar PV, and energy storage with single-phase AC grid through high-frequency galvanic isolation. The single-stage approach reduces the component count, and the full-range softswitching feature realizes higher efficiencies compared to the state-of-the-art methods. A significant advantage...
The modular multilevel cascaded converter (MMCC) has been considered as a promising solution for integrating the utility-grade renewables to the medium-voltage (MV) power system. However, the implementation becomes difficult with the centralized control architecture as the cascaded numbers increase. This paper presents a distributed control technique for the cascaded converter, which significantly...
Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
This paper presents a single-stage soft-switching high-frequency link isolated converter for bidirectional motor drive applications. The ‘minimal’ topology is based on the recently proposed soft-switching solid-state transformer (S4T) with a single current-source power conversion stage. This single stage approach reduces total switch rating, provides sinusoidal input and output voltages, and uses...
This paper proposes a 5-level single-phase multilevel inverter topology with reduced number of components. In order to validate the proposed structure, simulation and experimental results are presented. In addition, the proposed topology is compared with an existing counterpart structure in terms of number of levels and number of devices and value of power supply.
A battery-free power management circuit (PMC) for an impact-type piezoelectric energy harvester for micro wind is presented in this paper. As the energy generated by micro wind is intermittent, sleep mode is adopted for the PMC to save power. A new energy sensing circuit is designed to detect the energy level generated by the piezoelectric cantilever and then to control the operation modes, sleep...
A current-fed soft-switching three-phase dc-dc converter suitable for high-power high-voltage-gain applications is presented in this paper. Proposed converter consists of constant-current-fed three-phase inverting bridge with reverse-blocking switches, primary-Y-connected three-phase transformer and voltage-doubler rectifier modules at the output. The rectifier modules are connected in series at the...
As the penetration level of wind power increases, displacing conventional power generation with wind power will reduce the inertia of power system and decrease the frequency stability. Energy storage devices with only 5% energy storage of wind farm's rated capacity can produce the same virtual inertia as a same capacity synchronous generator. To reduce the additional costs of individual energy storage...
This paper presents theoretical and experimental discussions on low-voltage-ride-through (LVRT) operation of a modular multilevel single-delta bridge-cell (SDBC) inverter intended for utility-scale photovoltaic (PV) systems. As the penetration of distributed generation from renewable energy sources connected to medium- and high-voltage grids increases, grid-tied inverters progressively need to abide...
This paper presents a novel method for fault detection and location in modular five-level converters (MFLC) based on stacked sparse autoencoder (SSAE). SSAE is composed of multiple SAE and a softmax classifier. The capacitor voltage signals of all sub-modules (SMs) in the MFLC circuit are combined into a multi-channel signal. By moving window along the multi-channel signal, a set of signal segments...
Grid connected PV systems are the most popular solar electric system on the market today. The most important device in the grid-connected PV system is the inverter. This paper presents a survey on the grid connected PV inverters and the system topologies used for grid connected PV system. The review describes different two level inverter topologies as well as multilevel inverter topologies. Cascaded...
A novel topology is proposed that interfaces between one or multiple DC sources and a three-phase machine. The DC-side converter consists of two half-bridges that form a specialized converter. The half-bridges operate at a reduced voltage which reduces inductor effort and switching losses. The resulting four DC-link levels power two three-phase bridges that can drive open-winding machines. The circuit...
A dual active bridge (DAB) converter is a widely used structure in the low voltage direct current (LVDC) distribution system. In the case of the conventional single-level DAB, the higher the input and output voltage, the higher the voltage stress that the power switch must withstand. To solve this problem, a multi-level structure can be applied to the DAB converter to have low voltage stress of the...
In order to solve the equivalent inductance calculation problem caused by rectifier which AC side connected LCL resonant converter, a power factor calculation method for the rectifier which AC side connected LCL resonant converter is proposed. Based on the analysis of the working state of the rectifier which connected the critical conduction mode (CRM) LCL resonant converter, a mathematical model...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
The objective of the concept of T-type Modular Multilevel Converter (TMMC) is to improve the power density of the traditional Modular Multilevel Converter (MMC) exploited in medium voltage motor drive. The size of the major volume contributor “capacitor” can be reduced by 30%∼40% with the proposed circuit operating at only half dc link voltage at low frequency low voltage region, which is enabled...
In most inverters, it is required to obtain ac power with reduced cost. Especially, in power conditioners for small power like photovoltaic power generation, the reduced cost is more important. Because the circuit construction is very simple, so there would be little room to modify its fundamental construction. In such situations, some novel circuit constructions were proposed by the authers. In this...
Bridge modular switched-capacitor converter (BMSCC) has been reported with symmetric and modular structure, and featured less output voltage ripple, less components cost, and convenient voltage extension but weak output voltage regulation. This paper presents a phase shift plus pulse width modulation (PWM) control strategy for the novel resonant BMSCC. With this control method, output voltage regulation...
In this paper, a cascaded multilevel inverter is implemented for resistive as well as RL load. Working of Cascaded multilevel inverter is studied for various levels of voltages by implementing proper switching. To verify the operation of the proposed inverter, simulation is completed using MATLAB for various levels of outputs such as nine, eleven, fifteen, twenty seven, thirty three and thirty nine...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.